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<p>The temperature dependences of electrical resistance were measured four-probe method. The analysis of the continuous structural evolution of the YBa<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> superconductor using low-temperature X-ray diffraction have been performed. In the normal state, the dependences of the temperature coefficients of electrical resistance (<i>α</i><sub>ρ</sub>) on the volumetric thermal expansion (<i>α</i><sub>V</sub>) are close to linear with correlation coefficients (correspondence) <i>r</i> ~ 0.98. In the region of the transition to the superconducting state, the temperature dependences of αρ and α<sub>V</sub> exhibit anomalies in the form of maxima and minima of the functions. For each phase, the onset of the superconducting transition is accompanied by lattice compression, after which the volume grows in the region of the <i>T</i><sub>c</sub> value of these phases on the d<i>ρ</i>/d<i>T</i> dependence. In the region of transition to the superconducting state, significant changes in the degree of orthorhombicity are observed, in the form of its sharp increase to 0.01 and 0.009 at temperatures of 90 and 87&#xa0;K, respectively. It is shown that the volume change Δ<i>V</i>s in the temperature region from ~ 92 to ~ 90.5&#xa0;K is higher than for the interval from ~ 88 to ~ 87&#xa0;K and amounts to 0.73% and 0.58%, respectively. An attempt has been made to consider the origin of superconductivity from a position that takes into account the peculiarities of lattice deformation formation, considering the YBa<sub>2</sub>Cu<sub>3</sub>O<sub><i>y</i></sub> lattice as a system of interacting polarized atoms, using Slater’s ideas about the formation of elementary charge excitations in a condensed medium.</p>

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High-temperature superconductor YBa2Cu3Oy: electrical properties and structural instability

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • A. E. Rabadanova,
  • S. Kh. Gadzhimagomedov,
  • D. K. Palchaev,
  • M. Kh. Rabadanov,
  • R. M. Emirov,
  • V. S. Efimchenko,
  • Zh. Kh. Murlieva,
  • Sh. P. Faradzhev,
  • N. M.-R. Alikhanov

摘要

The temperature dependences of electrical resistance were measured four-probe method. The analysis of the continuous structural evolution of the YBa2Cu3Oy superconductor using low-temperature X-ray diffraction have been performed. In the normal state, the dependences of the temperature coefficients of electrical resistance (αρ) on the volumetric thermal expansion (αV) are close to linear with correlation coefficients (correspondence) r ~ 0.98. In the region of the transition to the superconducting state, the temperature dependences of αρ and αV exhibit anomalies in the form of maxima and minima of the functions. For each phase, the onset of the superconducting transition is accompanied by lattice compression, after which the volume grows in the region of the Tc value of these phases on the dρ/dT dependence. In the region of transition to the superconducting state, significant changes in the degree of orthorhombicity are observed, in the form of its sharp increase to 0.01 and 0.009 at temperatures of 90 and 87 K, respectively. It is shown that the volume change ΔVs in the temperature region from ~ 92 to ~ 90.5 K is higher than for the interval from ~ 88 to ~ 87 K and amounts to 0.73% and 0.58%, respectively. An attempt has been made to consider the origin of superconductivity from a position that takes into account the peculiarities of lattice deformation formation, considering the YBa2Cu3Oy lattice as a system of interacting polarized atoms, using Slater’s ideas about the formation of elementary charge excitations in a condensed medium.